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Issue 5, 2011
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Anion specificity induced conformational changes in cresol-based tripodal podands controlled by weak interactions: structural and Hirshfeld surface analysis

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Abstract

N-bridged tripodal receptors have shown a distinct behaviour on their assembly and binding ability towards complexation with inorganic and organic anions. All supramolecular complexes have been structurally authenticated using X-ray diffraction with a detailed analysis of the Hirshfeld surfaces facilitating an understanding of the type and nature of intermolecular interactions present in the complexes and extended structures. The p-substituted podand (L11) crystallized in the symmetric rhombohedral R3c space group to form hemicarcerand in the solid state via intermolecular C–H⋯π interactions. Protonation of L1–31–3 in presence of inorganic anions results in conformational locking of tripodal cavity by N–H⋯Oether trifurcated hydrogen bond formation (1–4) due to the endo-orientation of the bridgehead hydrogen whereas use of organic anions as template leads to the exo-orientation of the apical proton (5–7) and thereby, results into conformational opening of the tripodal arms via the formation of N–H⋯Oanion and π⋯π interactions with the anion. This study also establishes bilayer assembly formation in inorganic anion complexes (2–4) guided primarily by interligand C–H⋯π interactions and multiple C–H⋯anion hydrogen bonds. NMR studies further establish the different orientations of flexible tripodal arms in presence of organic and inorganic counter anions in solution.

Graphical abstract: Anion specificity induced conformational changes in cresol-based tripodal podands controlled by weak interactions: structural and Hirshfeld surface analysis

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Publication details

The article was received on 10 Aug 2010, accepted on 04 Nov 2010 and first published on 30 Nov 2010


Article type: Paper
DOI: 10.1039/C0CE00518E
Citation: CrystEngComm, 2011,13, 1664-1675
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    Anion specificity induced conformational changes in cresol-based tripodal podands controlled by weak interactions: structural and Hirshfeld surface analysis

    S. K. Dey, A. Pramanik and G. Das, CrystEngComm, 2011, 13, 1664
    DOI: 10.1039/C0CE00518E

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